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Investigation into durable polymers with enhanced toughness and elasticity for application in flexible Li-Ion batteries

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Jenkins, Craig, Coles, Stuart R. and Loveridge, Melanie J. (2020) Investigation into durable polymers with enhanced toughness and elasticity for application in flexible Li-Ion batteries. ACS Applied Energy Materials, 3 (12). pp. 12494-12505. doi:10.1021/acsaem.0c02442 ISSN 2574-0962.

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Official URL: http://dx.doi.org/10.1021/acsaem.0c02442

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Abstract

Next-generation wearable devices compel the development of lithium-ion batteries (LIBs) that can afford mechanical flexibility while remaining safe and stable energy sources. In conventional battery designs the electrode coatings are susceptible to fracture and disintegration when exposed to cyclic flexure. This results in capacity loss, resistance increases, and severely limits their cycle life. Polyurethane (PU) has been investigated as a battery binder but without research into the variety of chemistries available, and how they affect performance. This research investigates three different PU chemistries, each composed of a different polyol backbone–polyester, polyether and polycaprolactone. These are compared with PVDF, the most commonly used rigid binder in industry. The combination of electrochemical and mechanical characterization identified the importance of PU binder chemistry, particularly when the binder’s interaction with the electrolyte was considered. Both the polyester and polycaprolactone PU chemistries swelled significantly when placed in an electrolyte, compromising their conductive networks and mechanical advantages. In contrast, polyether PU was found to be a suitable binder for flexible batteries as it has strong adhesion and retains its properties even after swelling in the electrolyte. These findings present a promising polymer choice to facilitate the development of advanced and durable electrodes for flexible energy storage systems.

Item Type: Journal Article
Subjects: T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group)
Library of Congress Subject Headings (LCSH): Lithium ion batteries, Lithium ion batteries -- Materials, Lithium ion batteries -- Design and construction, Electric batteries , Electric insulators and insulation -- Polymers
Journal or Publication Title: ACS Applied Energy Materials
Publisher: American Chemical Society
ISSN: 2574-0962
Official Date: 28 December 2020
Dates:
DateEvent
28 December 2020Published
8 December 2020Available
3 December 2020Accepted
Volume: 3
Number: 12
Page Range: pp. 12494-12505
DOI: 10.1021/acsaem.0c02442
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Copyright Holders: Copyright © 2020 American Chemical Society
Date of first compliant deposit: 10 December 2020
Date of first compliant Open Access: 8 December 2021

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